Java Reference
In-Depth Information
For various technical reasons that don't have a lot of practical impact, Java can't always
initially detect syntax errors in the authority component. The immediate symptom of
this failing is normally an inability to return the individual parts of the authority, port,
host, and user info. In this event, you can call
parseServerAuthority()
to force the
authority to be reparsed:
public
URI
parseServerAuthority
()
throws
URISyntaxException
The original
URI
does not change (
URI
objects are immutable), but the
URI
returned will
have separate authority parts for user info, host, and port. If the authority cannot be
parsed, a
URISyntaxException
is thrown.
Example 5-6
uses these methods to split URIs entered on the command line into their
component parts. It's similar to
Example 5-4
but works with any syntactically correct
URI, not just the ones Java has a protocol handler for.
Example 5-6. The parts of a URI
import
java.net.*
;
public
class
URISplitter
{
public
static
void
main
(
String
args
[])
{
for
(
int
i
=
0
;
i
<
args
.
length
;
i
++)
{
try
{
URI
u
=
new
URI
(
args
[
i
]);
System
.
out
.
println
(
"The URI is "
+
u
);
if
(
u
.
isOpaque
())
{
System
.
out
.
println
(
"This is an opaque URI."
);
System
.
out
.
println
(
"The scheme is "
+
u
.
getScheme
());
System
.
out
.
println
(
"The scheme specific part is "
+
u
.
getSchemeSpecificPart
());
System
.
out
.
println
(
"The fragment ID is "
+
u
.
getFragment
());
}
else
{
System
.
out
.
println
(
"This is a hierarchical URI."
);
System
.
out
.
println
(
"The scheme is "
+
u
.
getScheme
());
try
{
u
=
u
.
parseServerAuthority
();
System
.
out
.
println
(
"The host is "
+
u
.
getHost
());
System
.
out
.
println
(
"The user info is "
+
u
.
getUserInfo
());
System
.
out
.
println
(
"The port is "
+
u
.
getPort
());
}
catch
(
URISyntaxException
ex
)
{
// Must be a registry based authority
System
.
out
.
println
(
"The authority is "
+
u
.
getAuthority
());
}
System
.
out
.
println
(
"The path is "
+
u
.
getPath
());
System
.
out
.
println
(
"The query string is "
+
u
.
getQuery
());
System
.
out
.
println
(
"The fragment ID is "
+
u
.
getFragment
());
}
}
catch
(
URISyntaxException
ex
)
{
